/****************************************************************************** * * Module Name: dsobject - Dispatcher object management routines * *****************************************************************************/ /* * Copyright (C) 2000 - 2012, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #include <acpi/acpi.h> #include "accommon.h" #include "acparser.h" #include "amlcode.h" #include "acdispat.h" #include "acnamesp.h" #include "acinterp.h" #define _COMPONENT ACPI_DISPATCHER ACPI_MODULE_NAME("dsobject") /* Local prototypes */ static acpi_status acpi_ds_build_internal_object(struct acpi_walk_state *walk_state, union acpi_parse_object *op, union acpi_operand_object **obj_desc_ptr); #ifndef ACPI_NO_METHOD_EXECUTION /******************************************************************************* * * FUNCTION: acpi_ds_build_internal_object * * PARAMETERS: walk_state - Current walk state * op - Parser object to be translated * obj_desc_ptr - Where the ACPI internal object is returned * * RETURN: Status * * DESCRIPTION: Translate a parser Op object to the equivalent namespace object * Simple objects are any objects other than a package object! * ******************************************************************************/ static acpi_status acpi_ds_build_internal_object(struct acpi_walk_state *walk_state, union acpi_parse_object *op, union acpi_operand_object **obj_desc_ptr) { union acpi_operand_object *obj_desc; acpi_status status; acpi_object_type type; ACPI_FUNCTION_TRACE(ds_build_internal_object); *obj_desc_ptr = NULL; if (op->common.aml_opcode == AML_INT_NAMEPATH_OP) { /* * This is a named object reference. If this name was * previously looked up in the namespace, it was stored in this op. * Otherwise, go ahead and look it up now */ if (!op->common.node) { status = acpi_ns_lookup(walk_state->scope_info, op->common.value.string, ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, NULL, ACPI_CAST_INDIRECT_PTR(struct acpi_namespace_node, &(op-> common. node))); if (ACPI_FAILURE(status)) { /* Check if we are resolving a named reference within a package */ if ((status == AE_NOT_FOUND) && (acpi_gbl_enable_interpreter_slack) && ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) || (op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP))) { /* * We didn't find the target and we are populating elements * of a package - ignore if slack enabled. Some ASL code * contains dangling invalid references in packages and * expects that no exception will be issued. Leave the * element as a null element. It cannot be used, but it * can be overwritten by subsequent ASL code - this is * typically the case. */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Ignoring unresolved reference in package [%4.4s]\n", walk_state-> scope_info->scope. node->name.ascii)); return_ACPI_STATUS(AE_OK); } else { ACPI_ERROR_NAMESPACE(op->common.value. string, status); } return_ACPI_STATUS(status); } } /* Special object resolution for elements of a package */ if ((op->common.parent->common.aml_opcode == AML_PACKAGE_OP) || (op->common.parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) { /* * Attempt to resolve the node to a value before we insert it into * the package. If this is a reference to a common data type, * resolve it immediately. According to the ACPI spec, package * elements can only be "data objects" or method references. * Attempt to resolve to an Integer, Buffer, String or Package. * If cannot, return the named reference (for things like Devices, * Methods, etc.) Buffer Fields and Fields will resolve to simple * objects (int/buf/str/pkg). * * NOTE: References to things like Devices, Methods, Mutexes, etc. * will remain as named references. This behavior is not described * in the ACPI spec, but it appears to be an oversight. */ obj_desc = ACPI_CAST_PTR(union acpi_operand_object, op->common.node); status = acpi_ex_resolve_node_to_value(ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &obj_desc), walk_state); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* * Special handling for Alias objects. We need to setup the type * and the Op->Common.Node to point to the Alias target. Note, * Alias has at most one level of indirection internally. */ type = op->common.node->type; if (type == ACPI_TYPE_LOCAL_ALIAS) { type = obj_desc->common.type; op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, op->common.node->object); } switch (type) { /* * For these types, we need the actual node, not the subobject. * However, the subobject did not get an extra reference count above. * * TBD: should ex_resolve_node_to_value be changed to fix this? */ case ACPI_TYPE_DEVICE: case ACPI_TYPE_THERMAL: acpi_ut_add_reference(op->common.node->object); /*lint -fallthrough */ /* * For these types, we need the actual node, not the subobject. * The subobject got an extra reference count in ex_resolve_node_to_value. */ case ACPI_TYPE_MUTEX: case ACPI_TYPE_METHOD: case ACPI_TYPE_POWER: case ACPI_TYPE_PROCESSOR: case ACPI_TYPE_EVENT: case ACPI_TYPE_REGION: /* We will create a reference object for these types below */ break; default: /* * All other types - the node was resolved to an actual * object, we are done. */ goto exit; } } } /* Create and init a new internal ACPI object */ obj_desc = acpi_ut_create_internal_object((acpi_ps_get_opcode_info (op->common.aml_opcode))-> object_type); if (!obj_desc) { return_ACPI_STATUS(AE_NO_MEMORY); } status = acpi_ds_init_object_from_op(walk_state, op, op->common.aml_opcode, &obj_desc); if (ACPI_FAILURE(status)) { acpi_ut_remove_reference(obj_desc); return_ACPI_STATUS(status); } exit: *obj_desc_ptr = obj_desc; return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_build_internal_buffer_obj * * PARAMETERS: walk_state - Current walk state * op - Parser object to be translated * buffer_length - Length of the buffer * obj_desc_ptr - Where the ACPI internal object is returned * * RETURN: Status * * DESCRIPTION: Translate a parser Op package object to the equivalent * namespace object * ******************************************************************************/ acpi_status acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state, union acpi_parse_object *op, u32 buffer_length, union acpi_operand_object **obj_desc_ptr) { union acpi_parse_object *arg; union acpi_operand_object *obj_desc; union acpi_parse_object *byte_list; u32 byte_list_length = 0; ACPI_FUNCTION_TRACE(ds_build_internal_buffer_obj); /* * If we are evaluating a Named buffer object "Name (xxxx, Buffer)". * The buffer object already exists (from the NS node), otherwise it must * be created. */ obj_desc = *obj_desc_ptr; if (!obj_desc) { /* Create a new buffer object */ obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_BUFFER); *obj_desc_ptr = obj_desc; if (!obj_desc) { return_ACPI_STATUS(AE_NO_MEMORY); } } /* * Second arg is the buffer data (optional) byte_list can be either * individual bytes or a string initializer. In either case, a * byte_list appears in the AML. */ arg = op->common.value.arg; /* skip first arg */ byte_list = arg->named.next; if (byte_list) { if (byte_list->common.aml_opcode != AML_INT_BYTELIST_OP) { ACPI_ERROR((AE_INFO, "Expecting bytelist, found AML opcode 0x%X in op %p", byte_list->common.aml_opcode, byte_list)); acpi_ut_remove_reference(obj_desc); return (AE_TYPE); } byte_list_length = (u32) byte_list->common.value.integer; } /* * The buffer length (number of bytes) will be the larger of: * 1) The specified buffer length and * 2) The length of the initializer byte list */ obj_desc->buffer.length = buffer_length; if (byte_list_length > buffer_length) { obj_desc->buffer.length = byte_list_length; } /* Allocate the buffer */ if (obj_desc->buffer.length == 0) { obj_desc->buffer.pointer = NULL; ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Buffer defined with zero length in AML, creating\n")); } else { obj_desc->buffer.pointer = ACPI_ALLOCATE_ZEROED(obj_desc->buffer.length); if (!obj_desc->buffer.pointer) { acpi_ut_delete_object_desc(obj_desc); return_ACPI_STATUS(AE_NO_MEMORY); } /* Initialize buffer from the byte_list (if present) */ if (byte_list) { ACPI_MEMCPY(obj_desc->buffer.pointer, byte_list->named.data, byte_list_length); } } obj_desc->buffer.flags |= AOPOBJ_DATA_VALID; op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc); return_ACPI_STATUS(AE_OK); } /******************************************************************************* * * FUNCTION: acpi_ds_build_internal_package_obj * * PARAMETERS: walk_state - Current walk state * op - Parser object to be translated * element_count - Number of elements in the package - this is * the num_elements argument to Package() * obj_desc_ptr - Where the ACPI internal object is returned * * RETURN: Status * * DESCRIPTION: Translate a parser Op package object to the equivalent * namespace object * * NOTE: The number of elements in the package will be always be the num_elements * count, regardless of the number of elements in the package list. If * num_elements is smaller, only that many package list elements are used. * if num_elements is larger, the Package object is padded out with * objects of type Uninitialized (as per ACPI spec.) * * Even though the ASL compilers do not allow num_elements to be smaller * than the Package list length (for the fixed length package opcode), some * BIOS code modifies the AML on the fly to adjust the num_elements, and * this code compensates for that. This also provides compatibility with * other AML interpreters. * ******************************************************************************/ acpi_status acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state, union acpi_parse_object *op, u32 element_count, union acpi_operand_object **obj_desc_ptr) { union acpi_parse_object *arg; union acpi_parse_object *parent; union acpi_operand_object *obj_desc = NULL; acpi_status status = AE_OK; u32 i; u16 index; u16 reference_count; ACPI_FUNCTION_TRACE(ds_build_internal_package_obj); /* Find the parent of a possibly nested package */ parent = op->common.parent; while ((parent->common.aml_opcode == AML_PACKAGE_OP) || (parent->common.aml_opcode == AML_VAR_PACKAGE_OP)) { parent = parent->common.parent; } /* * If we are evaluating a Named package object "Name (xxxx, Package)", * the package object already exists, otherwise it must be created. */ obj_desc = *obj_desc_ptr; if (!obj_desc) { obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_PACKAGE); *obj_desc_ptr = obj_desc; if (!obj_desc) { return_ACPI_STATUS(AE_NO_MEMORY); } obj_desc->package.node = parent->common.node; } /* * Allocate the element array (array of pointers to the individual * objects) based on the num_elements parameter. Add an extra pointer slot * so that the list is always null terminated. */ obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size) element_count + 1) * sizeof(void *)); if (!obj_desc->package.elements) { acpi_ut_delete_object_desc(obj_desc); return_ACPI_STATUS(AE_NO_MEMORY); } obj_desc->package.count = element_count; /* * Initialize the elements of the package, up to the num_elements count. * Package is automatically padded with uninitialized (NULL) elements * if num_elements is greater than the package list length. Likewise, * Package is truncated if num_elements is less than the list length. */ arg = op->common.value.arg; arg = arg->common.next; for (i = 0; arg && (i < element_count); i++) { if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) { if (arg->common.node->type == ACPI_TYPE_METHOD) { /* * A method reference "looks" to the parser to be a method * invocation, so we special case it here */ arg->common.aml_opcode = AML_INT_NAMEPATH_OP; status = acpi_ds_build_internal_object(walk_state, arg, &obj_desc-> package. elements[i]); } else { /* This package element is already built, just get it */ obj_desc->package.elements[i] = ACPI_CAST_PTR(union acpi_operand_object, arg->common.node); } } else { status = acpi_ds_build_internal_object(walk_state, arg, &obj_desc-> package. elements[i]); } if (*obj_desc_ptr) { /* Existing package, get existing reference count */ reference_count = (*obj_desc_ptr)->common.reference_count; if (reference_count > 1) { /* Make new element ref count match original ref count */ for (index = 0; index < (reference_count - 1); index++) { acpi_ut_add_reference((obj_desc-> package. elements[i])); } } } arg = arg->common.next; } /* Check for match between num_elements and actual length of package_list */ if (arg) { /* * num_elements was exhausted, but there are remaining elements in the * package_list. Truncate the package to num_elements. * * Note: technically, this is an error, from ACPI spec: "It is an error * for NumElements to be less than the number of elements in the * PackageList". However, we just print a message and * no exception is returned. This provides Windows compatibility. Some * BIOSs will alter the num_elements on the fly, creating this type * of ill-formed package object. */ while (arg) { /* * We must delete any package elements that were created earlier * and are not going to be used because of the package truncation. */ if (arg->common.node) { acpi_ut_remove_reference(ACPI_CAST_PTR (union acpi_operand_object, arg->common.node)); arg->common.node = NULL; } /* Find out how many elements there really are */ i++; arg = arg->common.next; } ACPI_INFO((AE_INFO, "Actual Package length (%u) is larger than NumElements field (%u), truncated\n", i, element_count)); } else if (i < element_count) { /* * Arg list (elements) was exhausted, but we did not reach num_elements count. * Note: this is not an error, the package is padded out with NULLs. */ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Package List length (%u) smaller than NumElements count (%u), padded with null elements\n", i, element_count)); } obj_desc->package.flags |= AOPOBJ_DATA_VALID; op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_ds_create_node * * PARAMETERS: walk_state - Current walk state * node - NS Node to be initialized * op - Parser object to be translated * * RETURN: Status * * DESCRIPTION: Create the object to be associated with a namespace node * ******************************************************************************/ acpi_status acpi_ds_create_node(struct acpi_walk_state *walk_state, struct acpi_namespace_node *node, union acpi_parse_object *op) { acpi_status status; union acpi_operand_object *obj_desc; ACPI_FUNCTION_TRACE_PTR(ds_create_node, op); /* * Because of the execution pass through the non-control-method * parts of the table, we can arrive here twice. Only init * the named object node the first time through */ if (acpi_ns_get_attached_object(node)) { return_ACPI_STATUS(AE_OK); } if (!op->common.value.arg) { /* No arguments, there is nothing to do */ return_ACPI_STATUS(AE_OK); } /* Build an internal object for the argument(s) */ status = acpi_ds_build_internal_object(walk_state, op->common.value.arg, &obj_desc); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Re-type the object according to its argument */ node->type = obj_desc->common.type; /* Attach obj to node */ status = acpi_ns_attach_object(node, obj_desc, node->type); /* Remove local reference to the object */ acpi_ut_remove_reference(obj_desc); return_ACPI_STATUS(status); } #endif /* ACPI_NO_METHOD_EXECUTION */ /******************************************************************************* * * FUNCTION: acpi_ds_init_object_from_op * * PARAMETERS: walk_state - Current walk state * op - Parser op used to init the internal object * opcode - AML opcode associated with the object * ret_obj_desc - Namespace object to be initialized * * RETURN: Status * * DESCRIPTION: Initialize a namespace object from a parser Op and its * associated arguments. The namespace object is a more compact * representation of the Op and its arguments. * ******************************************************************************/ acpi_status acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state, union acpi_parse_object *op, u16 opcode, union acpi_operand_object **ret_obj_desc) { const struct acpi_opcode_info *op_info; union acpi_operand_object *obj_desc; acpi_status status = AE_OK; ACPI_FUNCTION_TRACE(ds_init_object_from_op); obj_desc = *ret_obj_desc; op_info = acpi_ps_get_opcode_info(opcode); if (op_info->class == AML_CLASS_UNKNOWN) { /* Unknown opcode */ return_ACPI_STATUS(AE_TYPE); } /* Perform per-object initialization */ switch (obj_desc->common.type) { case ACPI_TYPE_BUFFER: /* * Defer evaluation of Buffer term_arg operand */ obj_desc->buffer.node = ACPI_CAST_PTR(struct acpi_namespace_node, walk_state->operands[0]); obj_desc->buffer.aml_start = op->named.data; obj_desc->buffer.aml_length = op->named.length; break; case ACPI_TYPE_PACKAGE: /* * Defer evaluation of Package term_arg operand */ obj_desc->package.node = ACPI_CAST_PTR(struct acpi_namespace_node, walk_state->operands[0]); obj_desc->package.aml_start = op->named.data; obj_desc->package.aml_length = op->named.length; break; case ACPI_TYPE_INTEGER: switch (op_info->type) { case AML_TYPE_CONSTANT: /* * Resolve AML Constants here - AND ONLY HERE! * All constants are integers. * We mark the integer with a flag that indicates that it started * life as a constant -- so that stores to constants will perform * as expected (noop). zero_op is used as a placeholder for optional * target operands. */ obj_desc->common.flags = AOPOBJ_AML_CONSTANT; switch (opcode) { case AML_ZERO_OP: obj_desc->integer.value = 0; break; case AML_ONE_OP: obj_desc->integer.value = 1; break; case AML_ONES_OP: obj_desc->integer.value = ACPI_UINT64_MAX; /* Truncate value if we are executing from a 32-bit ACPI table */ #ifndef ACPI_NO_METHOD_EXECUTION (void)acpi_ex_truncate_for32bit_table(obj_desc); #endif break; case AML_REVISION_OP: obj_desc->integer.value = ACPI_CA_VERSION; break; default: ACPI_ERROR((AE_INFO, "Unknown constant opcode 0x%X", opcode)); status = AE_AML_OPERAND_TYPE; break; } break; case AML_TYPE_LITERAL: obj_desc->integer.value = op->common.value.integer; #ifndef ACPI_NO_METHOD_EXECUTION if (acpi_ex_truncate_for32bit_table(obj_desc)) { /* Warn if we found a 64-bit constant in a 32-bit table */ ACPI_WARNING((AE_INFO, "Truncated 64-bit constant found in 32-bit table: %8.8X%8.8X => %8.8X", ACPI_FORMAT_UINT64(op->common. value.integer), (u32)obj_desc->integer.value)); } #endif break; default: ACPI_ERROR((AE_INFO, "Unknown Integer type 0x%X", op_info->type)); status = AE_AML_OPERAND_TYPE; break; } break; case ACPI_TYPE_STRING: obj_desc->string.pointer = op->common.value.string; obj_desc->string.length = (u32) ACPI_STRLEN(op->common.value.string); /* * The string is contained in the ACPI table, don't ever try * to delete it */ obj_desc->common.flags |= AOPOBJ_STATIC_POINTER; break; case ACPI_TYPE_METHOD: break; case ACPI_TYPE_LOCAL_REFERENCE: switch (op_info->type) { case AML_TYPE_LOCAL_VARIABLE: /* Local ID (0-7) is (AML opcode - base AML_LOCAL_OP) */ obj_desc->reference.value = ((u32)opcode) - AML_LOCAL_OP; obj_desc->reference.class = ACPI_REFCLASS_LOCAL; #ifndef ACPI_NO_METHOD_EXECUTION status = acpi_ds_method_data_get_node(ACPI_REFCLASS_LOCAL, obj_desc->reference. value, walk_state, ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &obj_desc->reference. object)); #endif break; case AML_TYPE_METHOD_ARGUMENT: /* Arg ID (0-6) is (AML opcode - base AML_ARG_OP) */ obj_desc->reference.value = ((u32)opcode) - AML_ARG_OP; obj_desc->reference.class = ACPI_REFCLASS_ARG; #ifndef ACPI_NO_METHOD_EXECUTION status = acpi_ds_method_data_get_node(ACPI_REFCLASS_ARG, obj_desc-> reference.value, walk_state, ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &obj_desc-> reference. object)); #endif break; default: /* Object name or Debug object */ switch (op->common.aml_opcode) { case AML_INT_NAMEPATH_OP: /* Node was saved in Op */ obj_desc->reference.node = op->common.node; obj_desc->reference.object = op->common.node->object; obj_desc->reference.class = ACPI_REFCLASS_NAME; break; case AML_DEBUG_OP: obj_desc->reference.class = ACPI_REFCLASS_DEBUG; break; default: ACPI_ERROR((AE_INFO, "Unimplemented reference type for AML opcode: 0x%4.4X", opcode)); return_ACPI_STATUS(AE_AML_OPERAND_TYPE); } break; } break; default: ACPI_ERROR((AE_INFO, "Unimplemented data type: 0x%X", obj_desc->common.type)); status = AE_AML_OPERAND_TYPE; break; } return_ACPI_STATUS(status); }